/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.carbondata.spark

import org.apache.spark.sql.catalyst.expressions.Attribute
import org.apache.spark.sql.optimizer.AttributeReferenceWrapper

case class CarbonAliasDecoderRelation() {

  val attrMap = new java.util.HashMap[AttributeReferenceWrapper, Attribute]

  def put(key: Attribute, value: Attribute): Unit = {
    attrMap.put(AttributeReferenceWrapper(key), value)
  }

  def getOrElse(key: Attribute, default: Attribute): Attribute = {
    val value = attrMap.get(AttributeReferenceWrapper(key))
    if (value == null) {
      default
    } else {
      if (value.equals(key)) {
        value
      } else {
        getOrElse(value, value)
      }
    }
  }
}
